[DETAIL] 1.The amplifier module features a terminal block and a DC 2.1mm power socket, compatible with most laptop power adapters, and supports direct connection via BT 5.0 for seamless pairing with various speakers. 2.Built-in filter capacitor enables effective sound signal processing, along with a knob potentiometer for convenient control of power on/off and V+/V- adjustments. 3.Supports dual amplifier boards with output options of 20W, 30W, or 50W, compatible with 4 to 8 ohm speakers, and provides both BT stereo and AUX audio input for flexible connectivity. 4.Designed with an acrylic protective shell and integrated protection features including reverse polarity, overvoltage, undervoltage, overtemperature, with self-recovery from overheating. 5.Delivers Smooth power-up, song skipping, or pause functions, suitable for speaker retrofitting, audio amplifier systems, and car BT audio upgrades. Specifications: Item Type: Power Amplifier Board Material: PCB Purpose: Digital Power Amplifier Board Model: ZK-502L BT Version: 5.0 (Unobstructed, Approx. 15m/49.2ft) Number Of Channels: Left and Right Dual Channels (stereo) Signal To Noise Ratio: >90 dB Adapted Speakers: 30W-200 W, 4ohm-8ohm Adapted Power Supply Voltage: 5-24V (optional 9V/12V/15V18V/24V and Other Adapters, High Power Recommended High Voltage) Power supply voltage: 12V-8 ohm/12W+12W, 4 ohm/20W+20W 15V-8 ohm/18W+18W, 4 ohm/30W+30W 19V-8 ohm/32W+32W, 4 ohm/45W+45W 24V-8 ohm/38W+38W, 4 ohm/50W+50W Protection Mechanism: Self Recovery Overheating Protection, Self Recovery Short Connection Protection Package List: 1 x Screw driver 8 x Screw 4 x Brass Connecting Rod 2 x Acrylic Board 1 x Knob 1 x Cable The input voltage cannot exceed 24V, otherwise the audio amplifier module will be damaged. Note: 1. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 2. Please allow slight dimension difference due to different manual measurements. Thank you for your understanding. [ATTRIBUTES] - Hign-concerned Chemical: None - Model Number: Power Amplifier Board - Recommended Headphone Maximum Impedance: < 32 Ohm - Hign-concerned Chemical: None - Model Number: Power Amplifier Board - Recommended Headphone Maximum Impedance: < 32 Ohm - Built-in Battery: No - Output Type: LINE OUT (AUDIO OUT) - Input Type: LINE IN (AUDIO IN) - Brand Name: LONGPEAN - Certification: None - Origin: Mainland China